BA 483 then BA 394 at Heathrow
Barcelona → London → Brussels
Timetable, London time
19:25BA 483 from Barcelona at the gate
18:10BA 394 to Brussels leaves the gate
22 h 45 apart on the timetable, overnight
BA 394 leaves 22 h 45 after BA 483 arrives on the timetable: more than half a day, so not a connection we count.